A 250 kg rock falls off a cliff and comes to rest on the ground, which is 42 m below the cliff.
At what point is the rock’s potential energy at maximum? How much P. E. does it have at this point?

there all right good

explanation:

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.